The Nittany Lions dropped three spots from their previous ranking of No. 5, which they held for two consecutive weeks.
Penn State held off Ohio State's second-half surge to defeat the Buckeyes in Columbus.
Evan Bell scored a pair of goals, and Brandon Biro, Evan Barratt, and Max Sauvé also found the back of the net on Sunday afternoon at Pegula Ice Arena.
Indiana snapped Penn State's seven-game unbeaten run, handing the 10-man Nittany Lions a 3-1 home loss.
Here are four reasons why you should watch the Nittany Lions take on Indiana Sunday afternoon.
Kaitlyn Hord's team-high 11 kills gave the Nittany Lions a much-needed boost in the 25-19, 25-17, 25-21 victory against the Hawkeyes.